In the summer of her third year at high school, Erika Kanzaki runs into a big problem. A younger student, the gentlemanly Nagumo, asks her out in a way that makes it difficult to turn him down. Still, they start a relationship, and act like lovers. Erika isn't sure if she really loves him yet, but going out with him just feels so good. If Nagumo, who loves her whole-heartedly, found out about this, he'd surely despise her... When Erika gets scared and tries to turn Nagumo away, he is hurt deeply...... Their feelings of sorrow intertwine in this sensitive romance.